Set up CI with Azure Pipelines (#501)

* Set up CI with Azure Pipelines

[skip ci]

* Update azure-pipelines.yml for Azure Pipelines

azure-pipelines.yml

@@ -0,0 +1,16 @@
+# Starter pipeline
+# Start with a minimal pipeline that you can customize to build and deploy your code.
+# Add steps that build, run tests, deploy, and more:
+# https://aka.ms/yaml
+
+trigger:
+  branches:
+    include:
+    - '*'
+
+pool:
+  vmImage: 'ubuntu-latest'
+
+steps:
+- script: echo Placeholder CI
+  displayName: 'Placeholder misaka'